Method of treating porous bodies with liquid preservative.



k H. S. LOUD; I NG POROUS BODIES WITH LIQYUID'PRIESE'RVATIVE, APPLlCATldN FILED J U'NE 8, 19.15-

METHOD OF TREAT] PatentedAug. 24;, 1915.

I x avwawtoz El i? HENRY S. LOUD, OF NEW YQEK, N. Y.

METHOD OF TREATING POROUS BODIES WITH LIQUID PEESERVATIVE.

Specification of Letters Patent.

Patented Aug. 24%, 1915.

Application filed June 8, 1915. Serial 1%.32338.

To all ZUILOTIZ- it may concern Be it known that I, HENRY S. LOUD, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented new and useful Improvements in Methods of Treating Porous Bodies with. Liquid Preserva ti ve, of which the following is a specification- My invention is an improvement in methods of impregnating wood and other porous bodies with preservative liquid under pressure, and consists in placing the body to be treated in a vessel and then hermetically scaling the vessel, and then forcing preservative liquid into the vessel in such manner as to intermittently drench the surface of the article, 2 l thus create a succession of covering films of liquid thereon, and meanwhile to increase the pressure of air contained in or introduced into the vessel upon said films, whereby colnmingled. preservative and air are forced" together under equal pressure into the pores. voids, interstices. and tissues of the article until the article is sufiiciently impregnated or is eventually submerged in the accumulated liquid to secure additional 'iinpregnation. In some cases it is found desirable to first subject the article to be treated to a vacuum and then todrench the same with the liquid under increasing air pressure.

lVhen the desired degree of pressure has been reached and the requisite amount of preservative forced into, and diffusedx through the article, the inflow of fluid is cut off, and the pressure within the vessel reduced to, or below, atmospheric, for a period .sutiicient to allow the excess liquid in the article to be ejected which usually requires not more than forty-five minutes, and then the surplus liquid is withdrawn under such reduced pressure.

In the accompanying diagrzunmatic draw ing is shown van apparatus ad pted for carrying out my improved process, in which A represents a suitable horizontally disposed cylinder in which a railw y tie 2 insertedfor treatment. Longitudinally disposed Within the cylinder are spray pipes 3 and t supported, if necessary, by means of arms or bracketso, one arranged above and .tive volumes theother below the tie, having jets or openings 6, for distributing the contents of the pipes over the surfaces of the tie.

7 is a feed pipeleading to the distributing pipes, and connected by means of the valved pipe 8 with a source of preservative supply.

9 is an injector nozzle connected by the valved pipe 10 with a source of compressed air supply.

11 is a vent pipe,controlled by the valve 12 to connect. the bottom of the cylinder with vacuum producing means 13 in a pressure gage, and 14 is a safety valve or valvecontrolled air vent.

1.5 is a valved pipe connecting the bottom of the cylinder with the source of preservative supply.

The manner in which the described apparatus carries out my improved process is as follows: The article to be treated, in this case a 'ailway tie, is inserted into the cylinder which is then closed and hermet'n cally sealed. The valve 12 being closed the preservative liquid is conveyed fromits source of supply through he pipe 8 into the spray pipes 3 and ec'either under liquid pressure alone or with the additional pressure of compressed air introduced through the injector 9, whereby the preservative is delivered in a fine or atomized spray upon and against the surfaces of the tie thoroughly drenching the same and creating thereover a iilzu of towing liquid, lvieanwhile the air within and delivered into the cyliruler is increasingly compres ed. whereby itforces preservative from this film into the pores and tissues of the tie ahead of, and couuningled with it.

After the initial drenching of the article the valve 16 in pipe 8 alternate closed and opened again preferabiy at short intervals, so as to increase the relative proper-4 tion of air injected into the art cle as COB:

pared with a continuous flow of liquid. This penetration of the two fiUKlS into the tie 'ina likened to successive minute pistons of d and air whereby the preservative is l. deeply into, and di'iiused throughout, the material.

It is ob this process degree of p'essure, respecheard and air .torced lnto thetie, the iong'th of time employed, &c.,

that in the carrying out of the requisite pressure the tie may he allowed to be submerged by the accumulating liquid and such additional pressure applied thereto as may be required to secure the injection of a desired greater total amount of liquid.

Then the inflow of fluid is cut off and the valve 1'2 in the pipe llis opened to draw oil the liquid and air under vacuum. thus completing the operation. Obviously the inflow of liquid as above set forth might submerge the tie before the requisite amount of comu'iingled preservative and air has been forced into the tie. in which case submergence is meanwhile prevented by allowing the excess liquid to flow back through the pipe 15 to its source of'supply while maintaining or increasing the pressure within the cylinder.

lVhile I have shown and described a cyl inder with a single tie, it is obvious that a larger cylinder may be employed and a plurality of ties treated therein.

In order to assure absolute uniformity in the treatmentof the bottom of the tie with that of the top portion, or the bottom tie of a plurality with the top one, during the period of submergehce of the tie, or ties. the pressure within the cylinder is maintained without increase by permitting a sul'licient amount of the contained air to escape through the ventvalve 14, this valvc being closed after subn'iergence has been reached, after which the pressure will continue to increase to the desired limit. a

Obviously, the amount and pressure of the accumulated air in the vessel may be regulated by means of the vent or safety valve ll.

Having thus described my invention, what I claim and desire to secure by Letters Patent is v ,1. The method which consists in intermittently covering a porous article with a flowin film of liquid. and surrounding such article with air under increasing pressure.

-2.The method which consists in inter-- mitlently covering a porous article with a flowing film of liquid, surrounding such article with air under increasing; pressure, and then cutting oil the inflow of liquid, reducing-,thc air pressure, and drawing oil the surplus liquid under such reduced pressure.

jecting, a porous article to a vacuum. then 7 flowing film of liquid, and meanwhile suhjectingr the article to air under increasing? pressure.

' The method which consists in first subintermittently drenching it with liquid under progressively increasing! air pressure.

G. The method which consists in subject in}: a porous article to a vacuum. then intern'iittently covering the article with a tlowing film of liquid, amlmeanw-hile surrounding the article with air under increasing pressure. then cutting oil the inflow of liquid. reducing, th air pressure. and drawing oil the surplus liquid under such reduced pressure.

7. The method which consists in subject ing a porous article to a vacuum in a closed vessel, then intermittently covering the" article with a flowing film of liquid'aud meanwhile increasing the air pressure in said vessel and permitting .the surplus liquid accumulated in the vessel to drain away to prevent sulnnerfjence oi the article, then allowing the surplus liquid to accu mulate and submerge the article without increasing the air pressure, then again increasing the pressure. then cutting oil the inflow of liquid, reducing the pressure, and drawing" otl the surplus liquid under such reduced pressure. i

S. The method which consists in subjecting' a porous article to a vacuum in a hermetically sealed vessel. then intermittently covering the article with a flowing filn'ro't liquid. and meanwhile"increasing the air pressure in said vessel, then cutting oil the inflow of liquid, and reducing the air pres sure fma periodsuilicient to allow the surplus liquid in'the article to be ejected, and drawing off such surplus liquid under such reduced pressure.

9. The method of impregnating wood and other porous material with a liquid which consists in confining the article in a, hermetically sealed vessel, then interii'iitt'entl drenching the material with the liquid to form a covering film, meanwhile subjecting said material to increasing air pressure, whereby the liquid of said film .is forced into the pores, voids and interstices of the material in advance of anclcmmninglcd with the air, and then permitting the accumulated liquid to submerge the material.

lll)

and increasing the pressure.

10. Themethod of impregnating wood and other porous material with a liquid which consists confining the article in a' hermetically sealed vessel, then intermittently drenching the material 'with the liquid to form a covering film, meanwhile subjecting said material to increasi w air pressure, whereby the liquid of said him is forced into the pores, voids and interstices 1 of the material in ad 'ance of and commingled with the air, and then permitting the accumulated liquid to submerge the material and increasing the pressure, then cutting off the inflow of fluid and then reducing said pressure and drawing off the liquid under such reduced pressure.

11. The method of impregnating wood and other porous material with a liquid which consists in confining the material in a hermetically sealed Vessel, then intermittently drenching the material with the liquid to form a covering film, meanwhile subjecting said material to increasing air pressure and permitting the accumulating liquid in the vessel to flow out of the vessel to prevent submergence of the article until the desired amount of commingled air and liquid has been injected intothe material, then shutting off the outflow of liquid from the vessel to permit complete submergence of the material Without in crease of pressure, then increasing the pressure to the desired limit. 1

12. The method of impregnating wood and other porous material with a liquid which consists in confining the material in a hermetically sealed vessel, then intermit tently drenching the material with the liquid to form a covering film, meanwhile subjecting said material to increasing air pressure and permitting the accumulating liquid in the vessel to flow out of the ressel to prevent submergence of the article until the desired amount of commingled air and liquid has been injected into the material, then shutting off the outflow of liquid from the vessel to permit complete submergence of the material without increase of pressure, then increasing the pressure to the desired limit, then cutting off the inflow of liquid, reducing the pressure and drawing oif the free liquid under such reduced pres sure.

Signed at New York, county and State of New York, this 7th day of June, 1915.

HENRY S. LOUD.

Copies of this 'patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. (3. 

